Diagnosis

Glomerulonephritis often comes to light when a routine urinalysis is abnormal. Tests to assess your kidney function and make a diagnosis of glomerulonephritis include:

• Urine test. A urinalysis might show red blood cells and red cell casts in your urine, an indicator of possible damage to the glomeruli. Urinalysis results might also show white blood cells, a common indicator of infection or inflammation, and increased protein, which can indicate nephron damage. Other indicators, such as increased blood levels of creatinine or urea, are red flags.
• Blood tests. These can provide information about kidney damage and impairment of the glomeruli by measuring levels of waste products, such as creatinine and blood urea nitrogen.
• Imaging tests. If your doctor detects evidence of damage, he or she may recommend diagnostic studies that allow visualization of your kidneys, such as a kidney X-ray, an ultrasound exam or a CT scan.
• Kidney biopsy. This procedure involves using a special needle to extract small pieces of kidney tissue for microscopic examination to help determine the cause of the inflammation. A kidney biopsy is almost always necessary to confirm a diagnosis of glomerulonephritis.